Generics

Which version of Java introduced the concept of Generics?

• 1.3
• 1.4
• 1.5
• 1.6

The primary purpose of Generics in Java is to:

• Improve performance
• Introduce new data structures
• Provide Type-Safety
• Support multi-threading

Which of the following is type-safe?

• ArrayList
• Arrays
• HashSet
• LinkedList

To which of these collections is type-casting required during retrieval?

• Arrays
• ArrayList before Java 1.5
• Generic ArrayList
• HashSet

Why were Generics introduced in Java 1.5?

• To provide type-safety to collections
• To improve collection performance
• To support new data structures
• To phase out arrays

In a generic `ArrayList<String>`, what type of objects can you add?

• Any Object type
• Only Strings
• Integer and Strings
• None

When defining `class Account<T>`, what does `T` represent?

• Tuple
• Type
• Text
• Template

Bounded types in Generics are used to:

• Increase collection size
• Limit the type of objects you can add to a collection
• Specify the exact size of a collection
• Improve collection performance

The syntax `ArrayList<? extends Number>` specifies:

• ArrayList that can hold Strings
• ArrayList that can hold Numbers and subclasses of Number
• ArrayList that holds any object type
• ArrayList that holds exclusively integers

What does the wildcard character (`?`) in Generics denote?

• A specific type
• Multiple types
• A type that extends another
• An unknown type